From: Myungho Jung <mhjungk@gmail.com>
To: Doug Ledford <dledford@redhat.com>,
Jason Gunthorpe <jgg@ziepe.ca>, Parav Pandit <parav@mellanox.com>
Cc: linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2] RDMA/cma: Rollback source IP address if failing to acquire device
Date: Wed, 9 Jan 2019 22:27:31 -0800 [thread overview]
Message-ID: <20190110062727.GA25844@myunghoj-Precision-5530> (raw)
If cma_acquire_dev_by_src_ip() returns error in addr_handler(), the
device state changes back to RDMA_CM_ADDR_BOUND but the resolved source
IP address is still left. After that, if rdma_destroy_id() is called
after rdma_listen(), the device is freed without removed from
listen_any_list in cma_cancel_operation(). Revert to the previous IP
address if acquiring device fails.
Reported-by: syzbot+f3ce716af730c8f96637@syzkaller.appspotmail.com
Signed-off-by: Myungho Jung <mhjungk@gmail.com>
---
drivers/infiniband/core/cma.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 63a7cc00bae0..8cd113b0ddfb 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -2963,13 +2963,22 @@ static void addr_handler(int status, struct sockaddr *src_addr,
{
struct rdma_id_private *id_priv = context;
struct rdma_cm_event event = {};
+ struct sockaddr *addr;
+ struct sockaddr_storage old_addr;
mutex_lock(&id_priv->handler_mutex);
if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
RDMA_CM_ADDR_RESOLVED))
goto out;
- memcpy(cma_src_addr(id_priv), src_addr, rdma_addr_size(src_addr));
+ /*
+ * Store the previous src address, so that if we fail to acquire
+ * matching rdma device, old address can be restored back, which helps
+ * to cancel the cma listen operation correctly.
+ */
+ addr = cma_src_addr(id_priv);
+ memcpy(&old_addr, addr, rdma_addr_size(addr));
+ memcpy(addr, src_addr, rdma_addr_size(src_addr));
if (!status && !id_priv->cma_dev) {
status = cma_acquire_dev_by_src_ip(id_priv);
if (status)
@@ -2980,6 +2989,8 @@ static void addr_handler(int status, struct sockaddr *src_addr,
}
if (status) {
+ memcpy(addr, &old_addr,
+ rdma_addr_size((struct sockaddr *)&old_addr));
if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
RDMA_CM_ADDR_BOUND))
goto out;
--
2.17.1
next reply other threads:[~2019-01-10 6:27 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-10 6:27 Myungho Jung [this message]
2019-01-14 22:20 ` [PATCH v2] RDMA/cma: Rollback source IP address if failing to acquire device Parav Pandit
2019-01-14 22:28 ` Jason Gunthorpe
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